[题目]It has been three years since I a teacher.A.becomeB.becameC.becomingD.to become 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】It has been three years since I ______ a teacher.
A.become
B.became
C.becoming
D.to become

【答案】B
【解析】题意：现在完成时里，since从句里动词应用一般过去时。故选B。

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